Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9623ced222f5f81…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 16:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed19b7036990f56115c0069530673e69 SHA-1: f3b95fb9df570e897d1916f1d6d4ead50ec1b2e3 SHA-256: a9623ced222f5f81f90d1e262aecd2948548522799b90940bd896bf07edaab27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and link farm indicators suggests the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb95ee3ff8---63863193872.pdf In PDF document text
    • http://otohyundaidanang.com/uploads/image/files/94782065080.pdfIn PDF document text
    • http://exim5.hu/_user/file/93439440027.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/zasakekenalepuguna.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/16000095779.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///89648066027.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/tedipelopawazopusewupo.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/rizubiwavuv.pdfIn PDF document text
    • http://ausafe.net/images/art/files/11146786792.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/5036195744.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/kobunedupuduz.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/91668812469.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/9850318790.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/javagi.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/riton.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9c54822bc65c0cc98689bac52af30ec6/99213050537.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/73106221667.pdfIn PDF document text
    • http://www.pvvc.cz/files/pekapuf.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911205710_virecs.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faaab15e13---57860403225.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/50796702266.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tewerojepanixegopepate.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fubelobakuxugebuxatarigi.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/migaserojevewelejujare.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/52571580143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=read+percy+jackson+and+the+lightning+thief+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 11280 bytes
SHA-256: 9862d8c40a69be9a39b8e32f49128e775275f2a975479598e6b1f09726ac46e9
font_02_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 15676 bytes
SHA-256: 7bf9b2a4b427624bc1de44e11df1ef49debb9a50c2b558341703c07536a0f92c

Open this report in the interactive analyzer, or submit your own file for analysis.